Connecting JavaScript Runtime Mechanics to React Internals

Most frontend candidate failures in React interviews stem from misunderstandings of pure JavaScript rather than React APIs. Bugs like stale closures inside `useEffect` or asynchronous callbacks reading outdated state variables are pure JavaScript closure behaviors.

These bridge lessons show how React hooks leverage JavaScript closures, how state batching mirrors microtask scheduling, and how object reference equality affects render memoization. Master the foundation that powers modern UI frameworks.